tinea capitis vs roundworm

tinea capitis and roundworm both are nouns.

Word	Noun	Adjective	Verb	Adverb
tinea capitis	Yes	No	No	No
roundworm	Yes	No	No	No

As nouns, roundworm is a hypernym of tinea capitis; that is, roundworm is a word with a broader meaning than tinea capitis:

tinea capitis: fungal infection of the scalp characterized by bald patches
roundworm: infections of the skin or nails caused by fungi and appearing as itching circular patches

Other hypernyms of tinea capitis include ringworm, tinea.

tinea capitis (noun)	roundworm (noun)
fungal infection of the scalp characterized by bald patches	unsegmented worms with elongated rounded body pointed at both ends; mostly free-living but some are parasitic
	infections of the skin or nails caused by fungi and appearing as itching circular patches